Total no Of tetrahedral holes and octahedral holes per unit cell in hcp are 1)8 2)12 3)18 4)4 Right - Chemistry - Solid State

Question

Total no Of tetrahedral holes and octahedral holes per unit cell in
hcp are 1)8 2)12 3)18 4)4 Right answer is (3) but how ?

Yasodharan · Accepted Answer

Dear Student,

The answer is Option (3) 18

Tetrahedral + Octahedral = 4+2 = 6 per cell

In HCP arrangement total 3 cells are there hence we get 3x6 = 18
for HCP and the tabulation of HCP voids is shown below,

Regards

Total no. Of tetrahedral holes and octahedral holes per unit cell in hcp are 1)8 2)12 3)18 4)4 Right answer is (3) but how.?